Key Seat wiper

Sliding sleeve type key seat reamer consists upper sub, mandrel, lower sub, sliding sleeve etc.
The sliding sleeve can move upward or downward and rotate freely on the mandrel.
Several spiral hard alloy blades are welded on the sliding sleeve and several saw-tooth jaws on both the top and the bottom of the sleeve.
When the saw-tooth jaws on the bottom end of upper sub are fitting with the saw-tooth jaws on the top end of the sliding sleeve, pressure and right hand rotary of the drill string cause jarring and freeing the sticking sliding sleeve; The saw-tooth jaws on the bottom end of the sliding sleeve are fitting with the saw-tooth jaws on the top end of the lower sub that could exert a certain tension force on the keyseat area to back reaming to destroy keyseat.